The S1 to SX50 series consists of ultra-zoom cameras, having longer zoom ranges and a more extensive list of features. The SX100 and later SX models are a more compact, affordable spin-off. The "SX" stands for "Super Zoom." All S and SX models feature image stabilization and varying degrees of manual control that are often superior then the average Point and Shoot camera.

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Depending on what happened you may find this is not something you want to try to fix.

If you dropped the camera then you have likely damaged some parts which will need to be replaced. Given the complexity and the special alignments needed you will not be able to bring this back to the same level of performance as it had when new. That is if you were able to replace the needed parts.

If you spills something onto the lens barrel you might be able to clean it off and get the camera working again. But without knowing what was spilled and where you may find this a hard fix as well.

OK, you'er going for it! What to do. First you'll need to get the repair manual for the camera look online for it otherwise you'll need to contact Canon. Next you'll need a set of tools like IFIXIT sells (the large tool kit). A good desk with a good lamp and steady hands. Good Luck!

There are various reasons why the lens might have got stuck, perhaps the commonest being dust, dirt or sand getting in between the barrel sections. As it opens, the lens acts like a bellows and sucks air and any dust or dirt it might be carrying into the lens. Sometimes this can be cleared by slipping the corner of a piece of good quality paper between the barrel sections and running it round the barrel, checking the paper often for fraying, or applying a vacuum cleaner to suck out any dirt. I once succeeded (on another camera) by alternating those processes several times. Make sure the battery is fully charged to ensure the zoom motor is operating at full power. Gently pushing or pulling on the lens barrel (whichever way it seems to want to be going) as you turn the camera on may help.

Other causes, apart from physical damage (which may well be apparent from a misaligned barrel) could be malfunction of any of the several motors, positions sensors and gears within the lens and would be likely to involve full lens disassembly to diagnose and repair, which is a fairly skilled undertaking.

What a time to drop it, before the eclipse! I hope you got a good view of it. Yes, brute force realignment is certainly possible, but it often does take a lot of force, more than anyone should feel comfortable applying to a delicate mechanism. But if the alternative is the bin... Probably the knife and the squeezing helped. Anyway, thank you for sharing your experience.